Effect of Ammonium Enrichment on Respiration, Zooxanthellar Densities, and Pigment Concentrations in Two Species of Hawaiian Corals
Effect of Ammonium Enrichment on Respiration, Zooxanthellar Densities, and Pigment Concentrations in Two Species of Hawaiian Corals
Date
1994-07
Authors
Stambler, Noga
Cox, Evelyn F.
Vago, Razi
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University of Hawaii Press
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Abstract
Small branch tips or "nubbins" of two species of Hawaiian
corals, Pocillopora damicornis (Linnaeus) and Montipora verrucosa Vaughan,
were exposed to four ammonium concentrations, ammonium-stripped < 2
uM), ambient (~2 uM), and two enriched (20 uM and 50 uM) in microcosm
tanks. Nubbins represent replicates of a single coral colony. We examined the
effect of ammonium enrichment on zooxanthellar densities, pigment concentrations,
and respiration rates of the nubbins. Nubbins of both P. damicornis and
M. verrucosa showed a trend of increased pigment concentration with elevated
ammonium concentration. Pocillopora damicornis increased from 9.3 ug chlorophyll
a cm-2 in the ammonium-stripped treatment to 24.8 ug cm-2 in the
50-uM ammonium treatment. Similarly, M. verrucosa increased from 1.9 to
19.4 ug chlorophyll a cm-2. There were no significant differences in algal densities,
pigment concentrations per cell, pigment ratios, or respiration rates.
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Stambler N, Cox EF, Vago R. 1994. Effect of ammonium enrichment on respiration, zooxanthellar densities, and pigment concentrations in two species of Hawaiian corals. Pac Sci 48(3): 284-290.
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